5R44E Overhaul Kit, new and ready to install. Fits the 5R44E. Ships fast from the USA.
If the 5R44E in your Ranger or Mazda B-Series is weeping from the pan or front seal, or the transmission is already on the bench for a drum, pump or valve body repair, the seals, gaskets and rings are the part of the job you do not want to chase one piece at a time. This is a new overhaul kit for the 4R44E, 5R44E and 5R55E family, kit number B056820A. It is the soft-parts kit: gaskets, oil seals, rubber rings, sealing rings and thrust washers. It does not include frictions or steels.
Sonnax explains that the 4R44E was introduced in 1995 behind the 2.3L and 3.0L engines in Ford and Mazda rear-wheel-drive trucks, and that from 1997 it became the five-speed 5R44E, with the 4.0L version becoming the 5R55E. Every clutch pack and servo in these units relies on rubber seals to hold apply pressure, and the sealing rings carry oil from the pump and case into the drums while they spin. Gaskets keep the pump, valve body and pan sealed. With heat and mileage the rubber hardens and shrinks, the paper gaskets compress, and pressure that should be applying a clutch bleeds back to the sump. A complete reseal restores that sealing, as long as the metal parts underneath are still in good shape.
A reseal fixes leaks and leaking apply circuits, but it will not fix worn valve body bores or burnt clutches. Sonnax points out that the 4R44E/5R55E valve body wears in several places, including the EPC circuit and end plugs that loosen in their bores, and that patch-fixing it is not practical. Run a line pressure test and check the EPC solenoid first, following our 5R55 harsh or delayed shift walkthrough. Then drop the pan. Clean fluid with no friction material means seals and gaskets may be all you need. Burnt material means the frictions are gone too, and you should look at a full rebuild kit instead of this one.
Kit B056820A is listed for the 4R44E, 5R44E and 5R55E in Ford and Mazda applications: the Ranger and B-Series, plus the 5R55E Explorer and Mountaineer. The listing does not narrow it to specific years, so match the pan gasket shape and the pump seal size against your unit before you start. It is not for the 5R55W and 5R55S used in 2002 and later Explorers and Mountaineers, or the 5R55N used in the Lincoln LS and Thunderbird; those are different transmissions. If you are unsure, send us your year and VIN. Our full list of parts for the family is on the 5R55 transmission parts page.
Clean every part and inspect the ring lands, bushings and servo bores before the new seals go in. Lube rubber seals with ATF or assembly lube, do not twist the sealing rings when you seat them, and use new bolts where the factory calls for them. The rear bushing and seal are much easier with the right puller, such as the OTC 6913 extension housing bushing remover. If the valve body failed the pressure test, fit a rebuilt 5R44E valve body at the same time, and replace a tired solenoid set with a Ranger shift solenoid kit while the pan is off. Fill with Mercon V. Sonnax notes that the factory fill in these units was an early Mercon V that shortened solenoid life, so remove all of the old fluid and flush the cooler and lines.
| Fits | 5R44E |
| Part type | Overhaul Kit |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. It contains gaskets, oil seals, rubber rings, sealing rings and thrust washers. If your frictions are burnt, you need a rebuild kit that includes them.
Kit B056820A is listed for the 4R44E, 5R44E and 5R55E, which includes the 5R55E Explorer and Mountaineer. It does not fit the 5R55W or 5R55S used from 2002 on.
Only if leaking seals are the cause. Test line pressure first and check the pan. Burnt friction material or a worn valve body needs more than a reseal.
Mercon V. Remove all of the old fluid and flush the cooler and lines so old fluid and debris do not reach the new parts.
On later trucks, yes. Sonnax notes that Ford units built after 2002 use adaptive shift strategy and should get a relearn after transmission service. Reset the adaptive values with a scan tool, then drive gently through every gear.
